What is the primary use of complete coagulation testing (PT, aPTT) in veterinary medicine?

• A. Measure blood glucose levels
• B. Assess renal function
• C. Evaluate clotting status; diagnose coagulopathies
• D. Evaluate liver enzymes

Answer: (C)

The key idea is that these tests measure how long it takes for plasma to form a clot, which directly reflects the activity of the body's coagulation system. PT and aPTT together assess different parts of the coagulation cascade (extrinsic and common pathways for PT; intrinsic and common pathways for aPTT), so they are used to evaluate overall clotting status and to detect coagulopathies such as factor deficiencies, inhibitors, liver-related changes in clotting factor production, or effects of anticoagulant therapy. They’re not used to measure glucose, renal function, or liver enzymes, which require other specific tests. In practice, these tests help diagnose bleeding disorders and guide further investigation or treatment decisions.